Articles: general-anesthesia.
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Anaesthetic residents used bag valve mask (BVM) or mouth mask (MM) ventilation, both with an O2 flow of 15 l min-1 to ventilate 30 ASA I or II anaesthetised patients for 4 min prior to endotracheal intubation. Mean nasopharyngeal O2 was higher with BVM (BVM 95% (S. D. 3%) MM 54% (S. ⋯ Gastric insufflation was detected in two MM and two BVM patients. This tended to be more severe with MM ventilation. Although MM ventilation has some important disadvantages it can be used effectively by resuscitators with little or no experience in its use.
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Core temperature decreases rapidly after induction of anesthesia, largely because heat is redistributed to peripheral tissues. The hypothesis that warming peripheral tissues before induction of general anesthesia (prewarming) minimizes hypothermia was tested. Because circulating blood volume may be greater during exposure to heat compared to cold, the hypothesis that prewarming decreases the amount of hypotension associated with induction of anesthesia was tested also. Finally, the hypothesis that the difference between direct radial arterial blood pressure and blood pressure measured oscillometrically at the brachial artery depends on thermoregulatory and anesthetic conditions was tested. ⋯ These data confirm our hypothesis that redistribution hypothermia can be minimized by preinduction warming of peripheral tissues. Prewarming decreases blood pressure but does not prevent subsequent hypotension after induction. The difference between radical arterial blood pressure and oscillometric blood pressure depends on thermoregulatory vasomotor changes but also may be influenced by vasodilation associated with administration of propofol and nitrous oxide.
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Acta Anaesthesiol Scand · Aug 1993
Analysis of lung density by computed tomography before and during general anaesthesia.
Pulmonary structure was analysed by means of computed tomography (CT) in 20 lung-healthy patients, relating tissue density to the attenuation value (AV) of a picture element. Regional density of pulmonary tissue (rlung) was determined using mean lung density in five regions of interest (ROI1-5) (sector method). Vertical and horizontal distributions of x-ray attenuation were analysed by density profiles, relating AV values to evenly distributed and normalised length scales. ⋯ The basal lung areas (ROI5) revealed a significantly increased tissue density (P < or = 0.01), reaching mean values of 0.94 g.cm-3 (right lung) and 0.814 g.cm-3 (left lung). Similarly, vertical density profiles showed a markedly enhanced rlung of the bottom of the lung in all patients, interpreted as atelectasis. The amount of atelectasis accounted for 4.8 +/- 2.6% (right lung) and 4.7 +/- 2.1% (left lung) of the intrapulmonary area.(ABSTRACT TRUNCATED AT 250 WORDS)
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Aust N Z J Obstet Gynaecol · Aug 1993
Comparative StudyCaesarean section anaesthesia and the Apgar score.
Retrospective comparison of epidural and general anaesthesia by a multivariate analysis of 1 and 5 minute Apgar scores did not show that general anaesthesia improves operating conditions for Caesarean section or reduces fetal trauma for preterm and term infants.
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We gave anesthesia for cesarean section to 30 year-old female with HELLP syndrome with bronchial asthma. HELLP syndrome is characterized by hemolysis, liver dysfunction and thrombocytopenia, besides syndrome of severe toxemia of pregnancy. ⋯ Though she had improvements of liver dysfunction and thrombocytopenia after operation, it took 2 days to extubated, because she had frequent attacks of bronchial asthma. We conclude that we should perform cesarean section for a patient with HELLP syndrome as soon as possible.